Add basic smoke tests of packaging

Cherry-picked from c9s, adjusted to the STI tests layout.

tests/smoke/runtest.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+set -eux
+
+# Currently there is no easy way to see the versions of installed packages.
+# Let's list them to make sure we're testing against the correct package set.
+rpm -qa | sort
+python3 -c 'import packaging'
+python3 -c 'from packaging import version; version.Version("2.5.1rc2")'
+python3 -c 'from packaging import specifiers; specifiers.SpecifierSet("~=1.0")'
+python3 -c 'from packaging import markers; markers.Marker("python_version>'"'"'2'"'"'")'
+python3 -c 'from packaging import requirements; requirements.Requirement('"'"'name[foo]>=2,<3; python_version>"2.0"'"'"')'
+python3 -c 'from packaging import tags; tags.Tag("py39", "none", "any")'
+python3 -c 'from packaging.utils import canonicalize_name; canonicalize_name("Django_foobar")'

tests/tests.yml

@@ -25,9 +25,13 @@
     - rpm_generators_unit_tests:
         dir: python-rpm-generators
         run: ./tests/download_data_and_run_pytest.sh
+    - smoke:
+        dir: .
+        run: ./smoke/runtest.sh
     required_packages:
     - fedpkg-minimal
     - mock
+    - python3-packaging
     - python3-pip
     - python3-pytest
     - python3-pyyaml